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Activity was assessed for a, BT0506GH20, b, BT0456GH20 c, BT0460GH20 and d, BT0459GH20. Procainamide labelled products were analysed as described previously for other assays and the samples were pre-digested with BT0455GH33, BT1044GH18 and BT0461GH2. The results are representative of at least three independent replicates.
